
import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class MyEclipseGen {

private static final String LL = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.";

public String getSerial(String userId, String licenseNum) {

   java.util.Calendar cal = java.util.Calendar.getInstance();

   cal.add(1, 3);

   cal.add(6, -1);

   java.text.NumberFormat nf = new java.text.DecimalFormat("000");

   licenseNum = nf.format(Integer.valueOf(licenseNum));

   String verTime = new StringBuilder("-").append(

     new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime()))

     .append("0").toString();

   String type = "YE3MP-";

   String need = new StringBuilder(userId.substring(0, 1)).append(type)

     .append("300").append(licenseNum).append(verTime).toString();

   String dx = new StringBuilder(need).append(LL).append(userId)

     .toString();

   int suf = this.decode(dx);

   String code = new StringBuilder(need).append(String.valueOf(suf))

     .toString();

   return this.change(code);

}

private int decode(String s) {

   int i;

   char[] ac;

   int j;

   int k;

   i = 0;

   ac = s.toCharArray();

   j = 0;

   k = ac.length;

   while (j < k) {

    i = (31 * i) + ac[j];

    j++;

   }

   return Math.abs(i);

}

private String change(String s) {

   byte[] abyte0;

   char[] ac;

   int i;

   int k;

   int j;

   abyte0 = s.getBytes();

   ac = new char[s.length()];

   i = 0;

   k = abyte0.length;

   while (i < k) {

    j = abyte0[i];

    if ((j >= 48) && (j <= 57)) {

     j = (((j - 48) + 5) % 10) + 48;

    } else if ((j >= 65) && (j <= 90)) {

     j = (((j - 65) + 13) % 26) + 65;

    } else if ((j >= 97) && (j <= 122)) {

     j = (((j - 97) + 13) % 26) + 97;

    }

    ac[i] = (char) j;

    i++;

   }

   return String.valueOf(ac);

}

public MyEclipseGen() {

   super();

}

public static void main(String[] args) {

   try {

    System.out.println("please input register name:");

    BufferedReader reader = new BufferedReader(new InputStreamReader(

      System.in));

    String userId = null;

    userId = reader.readLine();

    MyEclipseGen myeclipsegen = new MyEclipseGen();

    String res = myeclipsegen.getSerial(userId, "5");

    System.out.println("Serial:" + res);

    reader.readLine();

   } catch (IOException ex) {

   }

}

}
